Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual do Utilizador descarregar pdf (Página 35)

I. HARDWARE GUIDES 5. Personal488/MM

Personal488 User’s Manual, Rev. 3.0 I-19

Default Settings

There are presently two revision levels of GP488/MM board, Rev. A and Rev. B. The following figure

indicates the GP488/MM default configuration on a Rev. B board. The configuration is the same for

Rev. A, however, on Rev. A boards the JP2 and JP3 labels are reversed from that illustrated. Switch

SW1 controls the wait state generation and the I/O base address and interrupt response level. On the

Rev. B board, JP2 sets the interrupt request level and JP3 selects the DMA channel. On Rev. A boards,

the JP2 and JP3 labels are reversed from those shown in the following diagram. For both board

revision levels JP1 selects the clock source.

I/O Base Address Selection

The I/O base address sets the addresses used by the computer to communicate with the IEEE 488

interface hardware on the board. The address is normally specified in hexadecimal and can be

02E1

22E1

42E1

, or

62E1

. The registers of the IOT7210 IEEE 488 controller chip and other auxiliary

registers are then located at fixed offsets from the base address.

Most versions of Driver488 are capable of managing as many as four IEEE 488 interface boards. To

do so, the board configurations must be arranged to avoid conflict among themselves. No two boards

may have the same I/O address, but they may, and usually should, have the same DMA channel and

interrupt level.

The factory default I/O base address is

02E1

. To use another, set SW1 switches 4 and 5 according to

the following table and figure.

I/O Base Address Register

02E1 22E1 42E1 62E1

Read Register Write Register

02E1 22E1 42E1 62E1

Data In Data Out

06E1 26E1 46E1 66E1

Interrupt Status 1 Interrupt Mask 1

0AE1 2AE1 4AE1 6AE1

Interrupt Status Interrupt Mask 2

0EE1 2EE1 4EE1 6EE1

Serial Poll Status Serial Poll Mode

12E1 32E1 52E1 72E1

Address Status Address Mode

16E1 36E1 56E1 76E1

CMD Pass Through Auxiliary Mode

1AE1 3AE1 5AE1 7AE1

Address 0 Address 0/1

1EE1 3EE1 5EE1 7EE1

Address 1 End of String

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 399 400

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